Was Brown and Streza hit by ransomware?

Brown and Streza was listed by the Losttrust ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Losttrust ransomware group?

Losttrust is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Brown and Streza breach?

Losttrust published data attributed to Brown and Streza. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Brown and Streza

Claimed by Losttrust · listed 3 years ago

34m

Age

since listed · data leaked

Status timeline

ListedSep 26, 2023
Data leakeddate unknown

At a glance

Group: Losttrust
Status: Data leaked
Country: United States
Sector: Legal
Listed on leak site: Sep 26, 2023

About the victim

AI dossier — public-source company profile

Brown and Streza is a U.S.-based law firm specializing in comprehensive tax planning, trusts and estates, ultra-high-net-worth planning, charitable sector representation, business planning, mergers and acquisitions, and real estate. The firm serves families, businesses, entrepreneurs, investors, philanthropists, and charitable organizations through an integrated domestic and international legal services approach. It is headquartered in the United States and caters to high-net-worth and institutional clients.

Industry: Legal Services – Estate Planning, Tax & Business Law

Attack summary

Severity: critical — The firm handles highly sensitive legal, financial, and estate planning data for ultra-high-net-worth individuals, philanthropists, and businesses. Data published from a law firm of this profile almost certainly includes PII, financial records, trust documents, and confidential legal matters at significant scale, meeting the threshold for critical severity.

The Losttrust ransomware group claims to have compromised Brown and Streza and has published data from the firm. The disclosed status indicates data has been published, though no specific ransom amount or data size was stated in the post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Client legal documents
Tax planning records
Trust and estate files
Business planning materials
Mergers and acquisitions documents
High-net-worth client information
Charitable organization records
Real estate transaction documents

What the group claims

OUR MISSION Serve families, businesses, entrepreneurs, investors, philanthropists, and charitable organizations through our unified approach to business and personal planning. Provide exceptional, integrated domestic and international legal services in: • Comprehensive Tax Planning • Trusts & Estates Planning • Ultra-High-Net-Worth Planning • Trust & Estate Administration • Charitable Sector • Business Planning • Mergers & Acquisitions • Business Succession Planning • Real Estate Proactively serve clients, staff, and professional advisors by investing in technology, education, and long-term relationships.

Sources

Victim sitebrownandstreza.com

Source

Indexed 3 years ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Losttrust

Losttrust is a relatively new ransomware group that emerged in September 2023, operating with apparent financial motivations and demonstrating a broad international targeting scope across multiple sectors. The group's origin and affiliations remain largely undocumented by major threat intelligence organizations, with limited public reporting from established security firms regarding their operational structure or potential ransomware-as-a-service connections. Based on available victim data, Losttrust appears to employ opportunistic targeting methods, having compromised 53 known victims across diverse geographic regions including the United States, Italy, Germany, Argentina, and India, with particular focus on education, legal services, media organizations, food and agriculture companies, and government entities. The specific attack methodologies, initial access vectors, encryption techniques, and extortion tactics employed by Losttrust have not been extensively documented in public threat intelligence reports from major security vendors or law enforcement agencies. Given the group's recent emergence and limited visibility in established threat intelligence channels, their current operational status and activity levels remain unclear, though the breadth of their reported victim base suggests ongoing operations as of recent observations. The group has been linked to 53 public disclosures across our corpus. First observed on a leak site on September 26, 2023. The operation is currently inactive.

Also tracked as: LOST TRUST.

Timeline of this disclosure

September 26, 2023Brown and Streza listed by Losttruston the group's public leak site

Other recent disclosures by Losttrust

Losttrust has been linked to 53 public victims on Darkfield. A sample of the most recent:

See the full Losttrust dossier →

Sector and geography

This disclosure adds to ransomware activity in the Legal sector, which has 241 disclosures indexed across all operators we track. Geographically, Brown and Streza is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Losttrust means Brown and Streza appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on Losttrust's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.